/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package diet.controller;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**
 *
 * @author DungTT
 */
public class UploadFileServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>UploadFileServlet</title>");
            out.println("</head>");
            out.println("<body>");
            boolean isMultipart = ServletFileUpload.isMultipartContent(request);
            if (!isMultipart) {
            } else {
                FileItemFactory factory = new DiskFileItemFactory();
                ServletFileUpload upload = new ServletFileUpload(factory);
                List items = null;

                try {
                    items = upload.parseRequest(request);
                } catch (FileUploadException e) {
                    e.printStackTrace();
                }
                Iterator iter = items.iterator();
                Hashtable params = new Hashtable();
                String filename = null;
                while (iter.hasNext()) {
                    FileItem item = (FileItem) iter.next();
                    if (item.isFormField()) {
                        params.put(item.getFieldName(), item.getString());
                    } else {
                        try {
                            String itemName = item.getName();
                            filename = itemName.substring(
                                    itemName.lastIndexOf("\\") + 1);
                            String realPath = getServletContext().getRealPath("/")
                                    + "images/food\\" + filename;
                            File savedFile = new File(realPath);
                            item.write(savedFile);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }

                out.println("Image: <img src = 'images/food" + filename + "' />");
            }
            request.getRequestDispatcher("addFood.jsp").forward(request, response);

            out.println("</body>");
            out.println("</html>");

        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
